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-J. A. DAVIS, Decd.

H W.. A. DAVIS, Executor. PRESSER FOOT LIFTING MECHANISM.

No. 353,255? Patented Nov. 23, 1886.

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J. A. DAVIS, Deod.

W. A. DAVIS, Executor. PRESSER FOOT LIPTINGMEGHANISM.

No. 353,254. Patented Nov. 23, 1886;

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UNITED STATES PATENT OFFICE.

JOB A. DAVIS, OF BOSTON, MASSACHUSETTS; WILLARD A. DAVIS (EXECUTOR OF SAID J OB A. DAVIS, DECEASED) ASSIGNOR OF ONE-HALF TO LEE E.

MOORE, BOTH OF SAME PLACE.

PRESSER-FOOT-LIFTING MEGHANIS M.

SPECIFICATION forming part of Letters Patent No, 353,254, dated November 23, 1886. Application filed December 22, 1885. Serial No. 186,469. (No model.)

To all whom, it may concern.-

Be it known that 1,1013 A. DAVIS,Of Boston, in the county of Suffolk and State of Massachusetts, have invented a new and useful Improvement in Presser-Foot-Lifting Mechanism for Sewing-Machines, of which the following, taken in connection with the accompanying drawings, is a specification.

The object of my inventionis to provide a simple and effective mechanism for automatically lifting the presser-foot of a sewingmachine at intervals, my invention being more particularly intended for use with waxthread sewing-machines, and I have shown .15 the same in connection with the wax-thread sewing-machine embraced by my application No. 186,467, filed simultaneously herewith.

In the drawings, Figure lis a partial side elevation of a sewing-machine with my invention applied thereto. Fig. 2 is a detail View of the operating-cam and a part of the slotted rod. Figs. 3 and 4 are front views of the head of the machine, showing the presser bar and connections, the face-plate being re moved in the latter figure. Figs. 5, 6, and 7 are detail views of the gripping device for lifting the presser-bzn', Fig. 6 being a section on line yy, Fig. 7.

A denotes the arm of a sewing-machine, and B a ing or bearing thereon in which is journaled a rotating shaft, 0, provided with a cam, Z. X is a'slotted rod or bar embracing said shaft, and provided with a pin or roller, Y, held in engagement with the periphery of said cam. The rod Y is attached at its upper end to a lever, Q, pivoted at WV to the arm A, the forward end of said lever being connected by an adjustable link, a, with a block, 00 to which is pivoted, by a pin, t, a block, as, hav- 4o ing a vertical opening through which the presser-bar 1) passes, said bar being provided with an ordinary presser -foot, P. To the pressenbar p is attached, by a set-screw, y an arm, le on which bears a plate-spring, O, 5 for holding the presser-foot upon the work. The spring 0 passes through 2. lug, er of a bracket, U, and the stress of said spring may be regulated by an adjusting-screw, a, passing through the spring and impinging against said bracket.

Between the arm k and the block :0 is a spring, y, whichnormally presses the said block against a horizontal seat afforded by the lowerpart of thehead V of the arm A,thereby holding said block horizontal, so that the resser-bar may move vertically through the same to adjust itself to different thicknesses of material passing beneath the presserfoot P.

From the foregoing it will be apparent that when in the rotation of thecam Zthe projecting or full part thereof strikes the pin or roller Y the rod X will be depressed to lift the forward end of the lever Q, to which said rod is attached. This movement of said lever 6g raises the rod 2, causing the blocks 00 and a: to grip the presser-bar p, and thus lift the same by a cramping action, this lifting of the pressesbar occurring in a wax'thread machine when the feed takes place.

The pressenbar may be raised to release the work by an ordinary lifting-lever, N, or by means of a treadle-operated rod, z, attached to the rear end of the lever Q. The set-screw 3 passes through a slot in the face-plate, and thus holds the presser-bar from rotating.

I claim as my invention 1. In a sewing-machine, the combination, with a presser-bar,of a gripping-block through which said bar passes, a second block adapted S3 to bear against the presser-bar, and to which said gripping-block is pivoted, a lever connected with the said second block, and a cam. connected with said lever for operating the latter, substantially as set forth.

2. The combination, with the shaft C and the cam Z, of the rod X, lever Q, link 2, blocks 00 and 00, presser-bar p, springs y and 0, and arm k substantially as set forth.

3. The combination, with the main shaft 0 and its cam, of the rod X, the lever Q, the. presser-bar, and a gripping device surrounding said bar and connected with the said lever, substantially as set forth.

In testimony whereof Ihave signed my name 5 to this specification, in the presence of two subscribing witnesses, on this 13th day of No vember, A. D. 1885.

JOB A. DAVIS.

Witnesses:

MILAN F. SrnvnNs, WILLARD A. DAVIS. 

